linux-kernel - Re: [PATCH v3 08/10] staging: octeon-ethernet: support of_get_mac_address new ERR

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Date:   Fri, 3 May 2019 21:07:30 +0200
From:   Petr Štetiar <ynezz@...e.cz>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        linux-kernel@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v3 08/10] staging: octeon-ethernet: support
 of_get_mac_address new ERR_PTR error

Dan Carpenter <dan.carpenter@...cle.com> [2019-05-03 13:34:56]:

Hi,

> On Fri, May 03, 2019 at 09:56:05AM +0200, Petr Štetiar wrote:
> > There was NVMEM support added to of_get_mac_address, so it could now
> > return NULL and ERR_PTR encoded error values, so we need to adjust all
> > current users of of_get_mac_address to this new fact.
> 
> Which commit added NVMEM support?  It hasn't hit net-next or linux-next
> yet...  Very strange.

this patch is a part of the patch series[1], where the 1st patch[2] adds this
NVMEM support to of_get_mac_address and follow-up patches are adjusting
current of_get_mac_address users to the new ERR_PTR return value.

> Why would of_get_mac_address() return a mix of NULL and error pointers?

I've introduced this misleading API in v3, but corrected it in v4, so it now
returns only valid pointer or ERR_PTR encoded error value.

Just FYI, changes for staging/octeon are currently at v5[3].

1. https://patchwork.ozlabs.org/project/netdev/list/?series=105972
2. https://patchwork.ozlabs.org/patch/1094916/
3. https://patchwork.ozlabs.org/patch/1094942/

-- ynezz